atomic weight unit

简明释义

原子重量单位

英英释义

例句

1.When calculating the molecular mass, you need to consider the atomic weight unit for each element.

在计算分子质量时，你需要考虑每个元素的原子质量单位。

2.The periodic table lists the atomic weight units of all known elements.

元素周期表列出了所有已知元素的原子质量单位。

3.In chemistry class, we learned that one mole of carbon has an atomic weight unit of 12.

在化学课上，我们学到一摩尔碳的原子质量单位是12。

4.To convert grams to moles, you divide by the atomic weight unit of the substance.

要将克转换为摩尔，你需要除以该物质的原子质量单位。

5.The atomic weight of hydrogen is approximately 1.008 原子质量单位.

氢的原子质量大约是1.008 原子质量单位。

作文

The concept of the atomic weight unit is fundamental in the field of chemistry and physics. It serves as a standard measure for expressing the masses of atoms and molecules, allowing scientists to communicate effectively about the composition of matter. The atomic weight unit, often abbreviated as amu or u, is defined as one twelfth of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state. This definition provides a reference point against which the masses of all other atoms can be compared.Understanding the atomic weight unit is crucial for various applications, including stoichiometry, which is the calculation of reactants and products in chemical reactions. By knowing the atomic weights of different elements, chemists can determine how much of each substance is needed to achieve a desired reaction. For instance, if a chemist wants to synthesize water (H2O), they must know the atomic weights of hydrogen and oxygen to calculate the exact amounts required.Moreover, the atomic weight unit plays a significant role in molecular biology, particularly in the study of biomolecules such as proteins and nucleic acids. These large molecules are composed of smaller units called amino acids or nucleotides, respectively. Each of these components has a specific mass expressed in atomic weight units. By understanding these weights, researchers can analyze the structure and function of biomolecules, leading to advancements in biotechnology and medicine.In addition to its scientific importance, the atomic weight unit also has practical implications in industries like pharmaceuticals and materials science. When developing new drugs, pharmaceutical companies must consider the molecular weight of compounds to ensure their efficacy and safety. Similarly, in materials science, the properties of materials are often related to their atomic composition and weight, influencing decisions about what materials to use in construction or manufacturing.Despite its significance, the atomic weight unit can sometimes lead to confusion, especially when discussing isotopes. Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses. For example, carbon-12 and carbon-14 are both isotopes of carbon, but their atomic weight units differ due to their varying neutron counts. This distinction is critical in fields such as radiocarbon dating, where the ratio of carbon isotopes is used to determine the age of organic materials.In conclusion, the atomic weight unit is an essential concept that permeates various scientific disciplines. Its role in facilitating communication about atomic and molecular masses cannot be overstated. From aiding in chemical reactions to advancing medical research, the atomic weight unit is a cornerstone of modern science. Understanding this unit not only enhances our knowledge of the natural world but also equips us with the tools necessary to innovate and solve complex problems across multiple fields. Therefore, a solid grasp of the atomic weight unit is indispensable for anyone pursuing a career in science or engineering.

“原子质量单位”的概念在化学和物理学领域中是基础性的。它作为一个标准测量，用于表达原子和分子的质量，使科学家能够有效地交流物质的组成。“原子质量单位”，通常缩写为amu或u，定义为碳-12的一个无束缚中性原子的质量的十二分之一。这一定义提供了一个参考点，通过它可以比较其他所有原子的质量。理解“原子质量单位”对各种应用至关重要，包括化学计量学，即计算化学反应中的反应物和产物。通过了解不同元素的原子质量，化学家可以确定所需每种物质的确切数量，以实现期望的反应。例如，如果一位化学家想要合成水（H2O），他们必须知道氢和氧的原子质量，以计算所需的确切量。此外，“原子质量单位”在分子生物学中也扮演着重要角色，特别是在研究生物大分子如蛋白质和核酸时。这些大分子由称为氨基酸或核苷酸的小单位组成。每个组成部分都有一个特定的质量，以“原子质量单位”表示。通过理解这些质量，研究人员可以分析生物大分子的结构和功能，从而推动生物技术和医学的发展。除了科学上的重要性，“原子质量单位”在制药和材料科学等行业也具有实际意义。在开发新药时，制药公司必须考虑化合物的分子量，以确保其有效性和安全性。同样，在材料科学中，材料的性质通常与其原子组成和重量有关，这影响了选择用于建筑或制造的材料的决策。尽管“原子质量单位”具有重要意义，但在讨论同位素时有时会导致混淆。同位素是特定化学元素的变体，它们具有相同的质子数但不同的中子数，从而导致不同的原子质量。例如，碳-12和碳-14都是碳的同位素，但由于中子数的不同，它们的“原子质量单位”不同。这一区别在放射性碳测年等领域至关重要，其中碳同位素的比例用于确定有机材料的年龄。总之，“原子质量单位”是一个重要的概念，渗透到多个科学学科中。它在促进关于原子和分子质量的交流方面的作用不容小觑。从帮助化学反应到推动医学研究，“原子质量单位”是现代科学的基石。理解这一单位不仅增强了我们对自然世界的认识，还使我们具备了解决各个领域复杂问题所需的工具。因此，牢固掌握“原子质量单位”对于任何追求科学或工程职业的人来说都是不可或缺的。